THIS is a 12 SI alternator
THIS is a CS-130 alternator
SEE!
The A2000S sealed bearing in the back of the CS130? Well it becomes MAGNETIC when the alterntor is in operation. The exposed bearing is a MAJOR DESIGN FLAW that caused hundreds of thousands if not millions of these alternators to SEIZE UP destroying the rotor, the stator and the slip ring end housing. And everything else inside.
The CS130-D is an entirely and I mean ENTIRELY different alternator that DOES NOT HAVE AN EXTERNAL FRONT FAN. Both fans are inside SPOT WELDED to the rotor.
A person CAN NOT ASSSSSSSSSSSSSSSSSSUME just because a P30 chassis is a certain year it automatically means a certain alternator will be found there.
I have seen older chassis fitted with the CS-130, the CS-144, LESTEK aftermarket and even some nutso 10-SI retrograde refits. The alternator must be eyeballed to see what it is. ASS Out of You And Me has meaning here.
The 7294 94 amp STATOR is junk. It is the failure model of the 12 SI line. The 94 and 78 amp rotor are exactly the same (7294 and 7278). By changing the fan, I reduced RECTIFIER HEATSINK TEMPERATURE from 250+ degrees F to the high 180's. The turbine fan is junk II
The old TRANSPO or RENARD 12 SI rectifiers were the most durable. The 5056 with the 70 amp jumbo diodes I liked the best the 5054 with the 50 amp button diodes made for a 150 amp bridge. The Motorola RDT6 orange diode trio was the most reliable. I fell favor to either the Made in Poland 6203 front bearing or the Japanese NTN LUA bearing. The genuine Torrington MNJ671 rear bearing was also a favorite.
My choices were based SOLELY on durability and longevity. My intention was successful - my alternators far outlived the factory OE alternators. This is based on accurate record keeping of 10,000 to 20,000 units. Even the brushes were custom St. Mary's Carbon copper graphite hybrids. .030" longer than OE.
My customers included the LAFD, the LAPD, The Los Angeles County Sheriff's Office, Paramedics from Bakersfield to Orange County. My specialty modifieds were easy to spot - anodized black. I already mentioned Lockheed, and the Edwards AFB specialty units.
Manufacturing occupied 99% of my time. The battery testing was virtually automatic and a short cruise with a cup of coffee in the AM was enough supervision.
From around 2000 to present I lost my footing with keeping up to date with new releases. The 22, 26, 28, 33, SI Delco's are all new to me. The ND, Mitsubishi, Hitachi, ad nauseum oriental releases are all missing from my experiences. The ND hairpins are new but the old Delco 50DN and SI are not and they are the first of hairpin alternators. Vibration would eventually break square stator wire and it is not repairable. My 50SI has 1,100 amp 1675 PIV rectifiers (used in the plating industry) So 3,300 amperes of rectifier bridge is not likely to be compromised at 10% load value.
I've seen a hundred too many scumbag mass rebuilding facilities to suit me. They have their place --- Wingnuts and Velcro. But a motor home is not a chevy caprice or Ford Pinto.
Enough!
